Calix does not have summoning sickness and cannot be blocked by an opponent.
Steps
Deal combat damage to an opponent using Calix.
Calix's second ability triggers, creating a token copy of Three Blind Mice.
The Three Blind Mice token enters the battlefield with two lore counters on it due to Vorinclex, triggering its first and second chapter abilities, as well as Calix's first ability.
Resolve the Calix trigger, putting a +1/+1 counter on a creature you control.
Resolve the first Three Blind Mice trigger, creating a 1/1 Mouse creature token.
Resolve the next Three Blind Mice trigger, creating a token copy of the Three Blind Mice token.